Mapper90 added. It works fine. You need to reload the nes rom to get a 'Soft-Reset'.

Light-Gun added. Under the 'Input' bar, click 'No LightGun' to active Light-Gun. When shooting, hold L-button and touch the sub-screen. 'Swap screens' is recommended. R-button can be used to rewind game play.
sprite0y calculation for SP-pertile corrected, better.

V-flip for SP-pertile corrected, better.

A patch file added, used to correct the header of rom or modify the settings of nesDS.